Sewing-machine motor.



C. H. BEACH.

SEWING MACHINEVMOTOR.

APPLICATION men JUNE 21,1915.

Patented Jan, 1,1918

2 SHEETS-SHEET!- c. H. BEACH. SEWING MACHINE MOTOR.

APIPL'YCATION FILED JUNEZI. I915- 2 SHEETS-SHEET 2- UNITED STATES PATENT OFFICE.

CHESTER H. BEACH, 0F BACINE, WI SCONSIN, ASSIGNOR TO WISCONSIN ELECTRIC COMPANY, OF RACINE, WISCOENSIN, A CORPORATION Q! WISCONSIN.

S WING-Macrame moron.

Indication of Letters Patent.

Patented Jan. 1, 1918.

Application filed June 21, 1915. Serial No. 35,848.

To all whom it may concern:

Be it known that I, CHESTER H. BEACH, citizen; of the United States, residing at Racine, in the county of Racine and State of \Visconsin, have invented a certain new and useful Improvement in Sewing-Machine Motors, of which the following is a full, clear, concise, and exact description.

My invention relates to sewing machine motors. One of its objects is to provide simple and eflicient means whereby. the,ordinary driving belt of the machine can be utilized as the power transmission means for operatively connecting the shaft of the motor with the arm-shaft of the machine. An-

other object is to provide means whereby the opening and closing of the motor circuit, the driving connection between the motor and the sewin machine, and the various speeds at whic the machine is adapted to be driven by the motor may all be controlled throu h the treadle.

Withithe a ove objects in view, one feature of my invention relates to a switch controlling lever and to the means for operating the lever from the treadle. Another feature relates to the mounting of the belt adjusting pulleyupon the switch-controlling lever, thereby likewise lacing, under the control of the treadle,'t1e speed at which the machine may be driven by the motor. A further feature of the invention relates to the structure and location of the switch, the

switch preferably comprising a blade which is spring-pressed toward one of the brushes of the motor butnormally separated therefrom by an insulating strip adapted to be inserted or withdrawn by the aforementioned switch-controlling lever.

My inventionvand the several features thereof may be more readily understood by reference to the embodiment thereof illustrated in the accompanying drawings, in

which- Figure 1 is a top plan view of a. motor showing it in position upon the table-top of thesewing machine;

Fig. 2 is a detailed, plan view of a clamp employed in connection with my present in: vention, but forming the subject matter of another application;

Fig. 3 is a section on the line 3-3 of Fig. 2;

ig. 4 is a section on Fig. 1;

the" line 44 of I Fig. 5 is a longitudinal. central section of one end of the motor; and

Fig. 6 is a section on the line 6-6- of Elke reference numerals refer to like, parts throughout the several views.

The motor 1, which may be of any suitable type, has secured upon the underside of its base one member 2 of a clamp. The member 2 is L-shaped and the foot of the L is provided with a transverse slot/3 for receiving a screw 1 by which said member 2 and a base-plate 5 are attached to the underside of the motor-frame. As shown in F' s. 1 and 4, the member 2 extends rearwanfiy from the motor, and hence the slot 3 permits of the motor being adjusted to a slight extent either forwardly or rearwardly m order to locate the motor-shaft pulle 6 in proper position with res ect to the riving belt 7 of the sewing mac ine. The member 2, at its elbow,'is provided with a downwardly extending portion 8 constitutin one of the jaws of tluclamp, said jaw, ass iown most clearly inlFig. 4, projecting throu h an opening 9 commonly provided in t e table-top 10 for the belt 7 At its rear end the member 2 is provided with a headed stud 11 which passes through a slot 12 in the other member 13 of the clamp, thereby holding the two members 2 and 13 to other,

with the member 13 slidable longitu inally of the member 2. At its rear end the member -13 is provided with a downwardly extending jaw 14 adapted to engage over the rear end of the table-top. A coiled spring 15 scrvesto hold the jaws S and 14 in clam ing relation with the table-top 10. Itw1ll be seen that by merely pulling the jaws 8 and 14 apart and inserting one of the jaws in the opening 9 and the other over the rear ent.

As shown most clearly in Figs. 1 and 4, the usual groove in the periphery ofthe motor-shaft pulley 6 is in position to receive I the driving-belt .7 of the machine, said driving-belt normally extending into the groove ed, when the lever 17 is operated, to engage relation with the pulley. 6. The pulley 18 =thus controls the operative engagement of jhef'strip 26 which isinte the belt 7 withthef pulley 6. whereby the driving of the belt? by thepulley 6 and the speed at which the sewing'machineis driven are dependent upon the position of the pulley 18. -lVhen the pulley 18 is out of engagement with the belt said belt is out of-cooperative'relation with the pulley 6. The lever 17 is normally held by a spring 19 in the inoperative position shown in Fig. 4. A chain 20 secured at one end to'the lever 17 and at'its otherend to the treadle (not shown) of the machine permits of the tlever 17 being operated through the'medium of the-treadle and; being held at any position of its operation. The treadle may be. and preferably is. the usual foot treadle of the machine. The chain- 20. extends over a guide-pulley 21 conveniently mounted upon the member 13 of the clamp, and the portion of the chain 20 which runs over the pulley is preferably in the form of a coiled spring 22 which provides a more suitable running surface and at the same time renders the chain 20 somewhat yielding.

The lever 17 is also utilized for operating' the switch which controls the circuitof the motor. lever 17 is provided with a pin 23 which projects through one of the usual ventilatin openings inthe end of the motor-casing. The pin 23 extends into a slot 24 in of insulating material. Said plate of insulating material-consists of a lower portion 25 inwhich the slot24 is located and-an upwardlv extending-strip 26 which'extends through a guide-loop 27 upon the lower end of a flexible switch-blade 28. The spring tension of the blsde-28 tends to press the Same intocontact with one of the brush- "zlolders 29of=themotorpbut the bladeis norallv separated the brush holder by the insulating strip 26. As shown in Figs. 5 sncl- 6,oneof=thewiresBOof the motor cirthe belt 7 and move the same into operative 'tor circuit.

With this object in view. the

a plate When a pull is exerted upon the chain 20 for v that the low'er end 25 thereof is engaged by the pin 23 and the strip 26 thereo extends through the guide-loop 27 provided upon the lower ,end of the switch-blade 28. \Vhen pressure is removed from the chain 20 and the lever 17 returns to normal position. the insulating strip 26 is again moved up,and is inserted between the switch-arm 28 and the brush-holder 29. therebv opening the mo The parts nary be so adjusted that switchblade 28 is in its closed position just priorto the pulley 18 coming into engagement with the belt 7. The motor can thus be running without any resultant drive of, the machine. By a slight further pull upon the chain 20 the pulley 18 may be brought into engagement with the belt 7 and press the same into engagement with the pulley 6, thereby driving the pulley 16. which. as usual. is secured upon the end of the shaft 33 which 'extends longitudinally through the arm 3% of the machine. By suitably pulling upon the chain 20,'the belt 7 may be more or less tightened with respect to the pulley 6, thereby controlling the speed at which the sewing machine is driven.

It will be understood that when the motor is utilized for operating the sewing machine the usual connection between the drive-wheel of the sewing machine and the trea'clle will be made inoperative. such connection, as is wellknown, cons'istipg ofapitman extending from the treadleto the crank-pin of the drive-wheel. If it be desired to operate the machine by foot-power in the usual manner, this may be done merely by restoring the operative connection between the treadle and the drive-wheel and disconnecting the lower end of the chain 20 from thetreadle. The position of' the electric motor is such that it does not interfere wfth the driving of the machine by foot-power. though it may be readily removed from the table-top and wig; equal readiness ,be replaced when des1 "While, I have shown and described a. desirable commercial embodiment of the in-' 'cuit is secured to theswiteh-blade 28, while vention, it is obvious that other. embodiments the other wire-Bliseonhected directlyto-the' thereof maybe devised withoutdenarture. other brush-holder ;82 of the motor. The from the scope of the invention as-defin'ed in j otorcircuit is thusnonna'lly held open by v between the switch-blade 28 and the brush-holds? 29.

theaocompanying claims. 7

What I claim.1s: 1. In a sewing machine motor, the combicarried by said lever.

2. In a sewing machine motor, the combination with an electric motor and a pulley driven thereby, of a driving belt adjacent to said pulley, a switch for controlling the cir cuit of said motor, a lever for actuating said switch, a pulley carried by said lever for moving sald belt into operative engagement with said pulley, and means for operatively connecting said lever with the treadle of a sewinIg machine.

3. n a sewing machine motor, the combination with an electric motor, of a springtensioned switch-blade thereon tending to close the circuit of the motor; a. lever also associated with said motor; and a member of insulating material arranged to be shift-' ed by said lever either to permit the closure of said switch-blade or to hold the latter in its openposition'.

4. In a sewing machine motor, the combination with an electric motor, of a springtensioned switch-blade tending to press against one of the brush-holders of the m0- tor; an insulating strip normally inserted between said blade and brush-holder; and a lever for withdrawing or inserting said insulatin strip.

n a sewing machine motor, the combination with an electric motor and a pulley driven thereby, of a spring-tensioned switchblade tending to close the circuit of themetor; a member of insulating material normally holding said blade in its open position; a lever for shifting said insulating material to permit the closure of said switchblade;- and a beIt adjuSting pulley carried by said lever.

6. In a sewing machinemotor, the combination with an electric motor and a pulley p driven thereby, of a spring-tensioned switchblade tending to press against one of the brush-holders of the motor; an insulating strip normally inserted between said blade and brush-holder; a lever for withdrawing or inserting said insulating strip; and a beltadjusting pulley carried'by said lever.

In a sewing machine motor, the combination with an electric motor, of a circuitcontrolling swi ch located inside of the motor-casing, a lever pivoted upon the outside of the motor-casing for actuating said switch, and a belt-adjusting pulley carried by said lever.

8. In a sewing-machine motor, the combination with an electric motor, of a flexible switch-blade mounted inside of the motorcasing, said blade bein shaped at its end e5 said blade to either its open or closed pomtion; a lever pivoted upon the outside of the motor-casing and provided with means for reciprocating said insulatin strip; and a belt-adjusting pulley carried y said lever.

9. The combinatlon with a sewing machine havin a pair of pulleys and a belt connecting t e two, of an electric motor and a pulley driven thereby, a lever rovided with a belt-adjusting pulley an whereby said lever may be actuated to move said belt into contact with said motor driven pulley to thereby drive said belt. v

10. The combination with a sewing ma chine havin a'pair of pulleys and a belt connecting t e two, of an electric motor and a pulley driven thereby, a lever provided with a belt-adjusting pulley and resilient means whereby said lever may be' actuated to move said belt into contact with said motor driven pulley to drive said sewing machine at variable speeds.

11. The combination with a sewing machine having atable top, a pair of pulleys,

one above and one below said table top and a belt passing through openings in said table top and connecting said pulleys, of a base resting on said table top, a motor slidably mounted on said base, and means adapted when operated to cause a relative movement between said motor and said belt whereby the latter may be driven by said motor.

12. The combination with the driving ele ment of a sewing machine, of a motor and a pulley driven thereby, a lever, a belt-adjusting pulley carried by said lever, and normally out of operative engagement with said means driving element, and means for operating said lever whereby said driving element may be. moved into engagement with said firstnamed ulley.

13, he combination with the driving element of a sewing machine, a motor and a ulley driven thereby, of a lever, a belt-ad- JllStlIig pulley carried by said lever, and means for operating said lever whereby said driving element may be moved into engagement with said first-named pulley, said lever also being provided with means adapted to control the flow of current to said motor.

14. The combination with the driving element of a sewin machine, of a motor provided with a drlving pulley, and an idler pulley, said pulleys being positioned on opfposite sides of said driving element and-out ing element into engagement with as id driving pulley. v

15. In a motor of the type described, a driving pulley, and an idle pulley, and a. tension member connected to said idle pulley to provide means wherebythe operator may move said pulley into contact with the belt of a sewing machine to holdsaid belt in variable speed engagement, with said driving pulley;

16. In a device of the class described, an'

electric motor, sewing machine pulleys at a 5 fixed distance from each other, a belt connecting said pulleys, a pulley mounted ad'acent said belt and out 'of contact therewith and adapted to'be driven by said motor, 9.

pivoted lever, and resilient means at the control of the operator for rocking said 10 [ever about its pivot to move said bed; into driving engagement with said pulley.

In witness whereof, I hereunto subscribe my name this 17th day of June A. D., 1915,

' CHESTER H. BEACH: 

